Timeline
1914 1915 1916 1917 1918 1919
January, 1915
War becomes "Total War" with German Zeppelin air raid on England
February 4
Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.
April 25
Allies begin nine-month battle for the Turkish peninsula of Gallipoli.
May 7
U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.
August 30
Germany responds to U.S. anger by ceasing to sink ships without warning.
September 5
Tsar Nicholas takes command of the Russian armies.
September 15
British use gas in battle near Loos, but shifting winds cause 60,000 British casualties.
December 19
Sir Douglas Haig becomes commander of British Expeditionary Force.
December 28
Allies begin withdrawal of troops from Gallipoli.
War becomes "Total War" with German Zeppelin air raid on England
February 4
Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.
April 25
Allies begin nine-month battle for the Turkish peninsula of Gallipoli.
May 7
U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.
August 30
Germany responds to U.S. anger by ceasing to sink ships without warning.
September 5
Tsar Nicholas takes command of the Russian armies.
September 15
British use gas in battle near Loos, but shifting winds cause 60,000 British casualties.
December 19
Sir Douglas Haig becomes commander of British Expeditionary Force.
December 28
Allies begin withdrawal of troops from Gallipoli.
All the information that is found on the Timeline pages are from pbs: http://www.pbs.org/greatwar/timeline/index.html